Witryna29 paź 2015 · Oriental chestnut gall wasp (OCGW), Dryocosmus kuriphilus Yasumatsu, 1951 (Insecta, Hymenoptera, Cynipoidea, Cynipidae, Cynipini) is the only confirmed gall wasp species known to induce galls on chestnut trees in the genus Castanea Mill. (Fagaceae) ( Buffington and Morita 2009 , Melika et al. 2011 ). WitrynaScattered dead and drooping shoots on horse chestnut trees usually indicates damage by squirrels. Horse chestnut scale Circular white spots visible on trunks or large branches (and sometimes...
(PDF) Chestnut (Castanea sp.) 3 - ResearchGate
When cultivated close to other species of chestnut (including Japanese chestnut, C. crenata; American chestnut, C. dentata; and sweet chestnut, C. sativa), Chinese chestnut readily cross-pollinates with them to form hybrids. Chinese chestnuts have evolved over a long period of time in coexistence with the bark fungal disease chestnut blight (Cryphonectria parasitica, formerly Endothia parasitica), and have evolve… Chestnuts produce a better crop when subjected to chill temperatures during the dormant period. Frosts and snowfalls are beneficial rather than harmful to the trees. The dormant plant is very cold-hardy in Britain, to the Royal Horticultural Society's H6 hardiness rating, to -20°C. Chestnut is hardy to USDA zone 5, which is −29 °C (−20 °F) lower in average minimal temperature than London in zone 9. The young growth in spring, even on mature plants, however, is frost-tender; bud-burst … WitrynaCastanea crenata is a small to medium-sized deciduous tree growing to 10–15 m tall. The leaves are similar to those of the sweet chestnut, though usually a little smaller, 8–19 cm long and 3–5 cm broad. The flowers of both sexes are borne in 7–20 cm long, upright catkins, the male flowers in the upper part and female flowers in the ... chunky white discharge during sex
Other common pest and disease problems of horse chestnut
WitrynaThe oriental chestnut gall wasp ( Dryocosmus kuriphilus) is a serious pest that forms a gall in the growing chestnut shoots, thus stopping nut production. Biological and chemical controls are as yet ineffective for this wasp, but some Korean varieties show resistance to the wasp. Witryna2 mar 2024 · First discovered in the UK in 2015, the oriental chestnut gall wasp spreads through flight and likely entered the UK through plant imports. The wasp larvae cause abnormal growths, known as galls, on the buds and leaves of the sweet chestnut tree. Witryna27 kwi 2024 · Keywords: chestnut blight, Castanea sativa, Oriental chestnut gall wasp There are two quarantine pests affecting sweet chestnut ( Castanea sativa) in the United Kingdom, chestnut blight caused by the fungus Cryphonectria parasitica and the Oriental chestnut gall wasp (OCGW), Dryocosmus kuriphilus. determine the degree of the polynomial −36xz2